Abstract
THE principal methods for the determination of traces of oxygen in sodium metal are based on the titration of sodium monoxide after the metal has been amalgamated and the oxide filtered off1,2; distilled in vacuum3,4 ; or allowed to react with an alkyl halide5. A 2 gm. sample of sodium metal containing 50 p.p.m. oxygen contains 1.25 × 10−5 equivalents of sodium monoxide. In the alkyl halide method, the presence of a 7 × 103 fold quantity of sodium bromide introduces difficulties in the determination of sodium monoxide by conventional volumetric methods. Elsewhere this difficulty has been discussed and a solution suggested6. The amalgam and distillation methods also suffer from some disadvantages associated with quantitative separation and subsequent estimation of the oxide.
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